A5082759579- Iron-based superconductors research
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Magnetic and transport properties of perovskites and related materials
- Multiferroics and related materials
- 2D Materials and Applications
- Superconductivity in MgB2 and Alloys
- Graphene research and applications
- Magnetic Properties of Alloys
- Advanced Materials Characterization Techniques
- Magneto-Optical Properties and Applications
- Magnetic Field Sensors Techniques
- Nuclear materials and radiation effects
- High Entropy Alloys Studies
- Advanced materials and composites
- Inorganic Chemistry and Materials
- Theoretical and Computational Physics
- Nonlinear Optical Materials Studies
- Fusion materials and technologies
- Metallurgical and Alloy Processes
- Characterization and Applications of Magnetic Nanoparticles
- Solid-state spectroscopy and crystallography
McMaster University
2020-2025
Indian Institute of Science Education and Research, Bhopal
2020-2022
Rice University
1998
A recent advance in the study of emergent magnetic monopoles was discovery that monopole motion is restricted to dynamical fractal trajectories [J. N. Hallén et al. , Science 378 1218 (2022)], thus explaining characteristics noise spectra [R. Dusad al., Nature 571 234 (2019); A. M. Samarakoon Proc. Natl. Acad. Sci. U.S.A. 119 e2117453119 (2022)]. Here, we apply this novel theory explore dynamics field-driven currents, finding them composed two quite distinct transport processes: initially...
The lightweight high entropy alloy represents an innovative class of multicomponent systems that combine low density with the exceptional mechanical properties high-entropy alloys. We present a detailed synthesis and investigation 3d rich equiatomic superconductor Sc-Ti-V-Nb-Cu, which crystallizes in body-centered cubic structure. Magnetization, electrical resistivity, heat capacity measurements confirm weakly coupled bulk type II superconductivity 7.21(3) K transition temperature upper...
Dirac material LaCuSb 2 shows anisotropic superconducting response to applied magnetic fields.
Abstract Transition-metal-based carbides (TMCs), renowned for their exceptional hardness, mechanical strength, and thermal properties, have recently emerged as promising candidates topological superconductivity. In this study, we synthesized ReC in the NaCl structure at ambient pressure by substituting Mo or W Re-site. We investigated superconducting properties of Re1-x Tx C (where T = Mo, W) x 0.5 using magnetization, resistivity specific heat measurements. These compounds display type-II,...
We report on the growth of YCr6Ge6, which crystalizes in hexagonal crystal structure with Cr atoms adopting a kagome lattice. The plasmon dispersion YCr6Ge6 was investigated momentum resolved electron energy loss spectroscopy revealing an anisotropic behavior along [101̄0] (in-plane) and [0001] (out-of-plane) propagating directions. Group velocities are one order magnitude smaller than those traditional free-electron gas metals. Damping processes occur within particle–hole continuum band....
Abstract Two-dimensional (2D) van der Waals (vdW) magnetic materials have attracted a lot of attention owing to the stabilization long range order down atomic dimensions, and prospect novel spintronic devices with unique functionalities. The clarification magnetoresistive properties its correlation underlying configurations is essential for 2D vdW-based devices. Here, effect Co-doping on magnetotransport Fe 3 GeTe 2 been investigated. Magnetotransport measurements reveal an unusual Hall...
Underlying disorder in skyrmion materials may both inhibit and facilitate reorientations changes topology. The identification of these disorder-induced topologically active regimes is critical to realizing robust spintronic implementations, yet few studies exist for disordered bulk samples. Here, we employ small-angle neutron scattering (SANS) micromagnetic simulations examine the influence order on lattice formation, transition, reorientation dynamics across phase space a polycrystalline...
We have studied the superconducting properties of isostructural ternary noncentrosymmetric superconductors $\mathrm{Ta}X\mathrm{Si}$ $(X=\mathrm{Re}, \mathrm{Ru})$ with help muon spin rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ and density functional theory calculations. Our transverse-field $\ensuremath{\mu}\mathrm{SR}$ measurements indicate isotropic $s$-wave superconductivity in TaReSi multigap TaRuSi. Zero-field measurements, highly sensitive to very small magnetic fields, find...
The ${\mathrm{Ce}}^{3+}$ pseudospin-$1/2$ degrees of freedom in ${\mathrm{Ce}}_{2}{\mathrm{Zr}}_{2}{\mathrm{O}}_{7}$ possess both dipolar and octupolar character which enables the possibility novel quantum spin liquid ground states this material. Here we report muon relaxation rotation ($\ensuremath{\mu}\mathrm{SR}$) measurements on single-crystal samples zero magnetic field fields directed along $[1,\overline{1},0]$ $[1,1,1]$ crystallographic directions, for longitudinal transverse to...
Rhenium-based superconductors have recently attracted significant interest due to their unconventional superconducting properties. In this work, we report the synthesis and properties of new Re$_{7}$X$_{3}$ (X = Nb, Ta, Ti, Zr, Hf) binary alloys which maintain a fixed composition rhenium while crystallizing in centrosymmetric non-centrosymmetric crystal structures, depending on elements X site. Comprehensive structural were investigated using powder x-ray diffraction, AC transport,...
Topologically non trivial spin textures host great promise for future spintronic applications. Skyrmions in particular are of burgeoning interest owing to their nanometric size, topological protection, and high mobility via ultra-low current densities. It has been previously reported through magnetic susceptibility, microscopy, scattering techniques that Co$_{8}$Zn$_{8}$Mn$_{4}$ forms an above room temperature triangular skyrmion lattice. Here we report the synthesis procedure...
ReS2, a layered transition metal dichalcogenide (TMD) with reduced crystal symmetry exhibiting unique anisotropic and layer-independent properties, holds great potential for optoelectronic photonic applications. Despite flurry of research activities in the third-order nonlinear optical response TMDs, tuning those properties completely reversible manner real time is challenge remains largely unexplored. Here, we experimentally demonstrate band edge carrier-induced sign reversal ultrafast...
Transient infrared (IR) laser spectroscopy near 3100 cm−1 was used to observe the ν1 and ν13 transitions of allyl radical, with their band origins found lie at 3113.9779(3) 3110.5 cm−1, respectively. Detailed assignment analysis transition identified over 1100 transitions, yielded improved values for ΔK ΦK ground state centrifugal distortion constants, as well a new set excited (ν1=1) rotational in addition determining origin. Transitions involving states quantum number up Ka=11 N=27 were...
We present the synthesis and physical properties of a breathing pyrochlore magnet ${\mathrm{CuAlCr}}_{4}{\mathrm{S}}_{8}$ via synchrotron x-ray diffraction, magnetization under ambient applied hydrostatic pressure, heat capacity, muon spin relaxation/rotation measurements. exhibits positive thermal expansion with concave upward temperature dependence. observed sharp antiferromagnetic ordering transition purely magnetic nature at 20 K, which shifts by as much 3.2 K on application 600 MPa...
We present a comprehensive study on superconducting properties of Re$_7$B$_3$ and Re$_3$B through specific heat, magnetic susceptibility, resistivity, transverse zero-field muon spin rotation/relaxation ($\mu$SR) experiments polycrystalline samples. (T$_C$ = 3.2~K) is non-centrosymmetric type-II ($\kappa$ $\approx$ 9.27) superconductor in the weak coupling ($\lambda_{e-ph}$ 0.54) regime. On other hand, 5.19~K) centrosymmetric 34.55) moderate 0.64) Our transverse-field $\mu$SR measurements...
We have investigated the superconducting properties in a single crystal of new superconductor Pb$_{2}$Pd via various techniques including magnetization, AC transport, transverse field muon spin rotation and relaxation (TF-$\mu$SR), heat capacity. crystallizes body-centred tetragonal structure with space group I4/$mcm$. All measurements confirm transition temperature, T$_{C}$ = 3.0 $\pm$ 0.1 K. Electronic specific data are well described by BCS fitting, suggesting that opens an isotropic gap...
Here, the authors report on superconducting properties of ternary noncentrosymmetric superconductor Re${}_{8}$NbTa, a new member Re-based superconductors that are known for frequent occurrence time-reversal symmetry breaking and their complex ground states. Bulk transverse field muon spin rotation/relaxation (\ensuremath{\mu}SR) measurements confirm moderately coupled, fully gapped superconductivity. However, zero-field \ensuremath{\mu}SR indicate possible presence fluctuation/time-reversal...
We present comprehensive investigations into the structural, superconducting, and topological properties of ${\mathrm{Bi}}_{2}\mathrm{PdPt}$. Magnetization heat-capacity measurements performed on polycrystalline ${\mathrm{Bi}}_{2}\mathrm{PdPt}$ demonstrate a superconducting transition at $\ensuremath{\simeq}$ 0.8 K. Moreover, muon spin relaxation/rotation ($\textmu{}\mathrm{SR}$) evidence for time-reversal symmetry preserving, isotropically gapped state in have also density-functional theory...
One branch of the La-214 family cuprate superconductors, La1.6-xNd0.4SrxCuO4 (Nd-LSCO), has been significant and sustained interest, in large part because it displays full complexity phase diagram for canonical hole-doped, high Tc superconductivity, while also displaying relatively low superconducting critical temperatures. The Tc's imply that experimentally accessible magnetic fields can suppress superconductivity to zero temperature. In particular, this enabled various transport...
Valence-skipped superconductors are natural candidates for unconventional superconductivity because they can exhibit a negative effective, attractive interaction electron pairing. This work reports comprehensive x-ray diffraction, magnetization, specific heat, and muon spin rotation relaxation measurements ($\ensuremath{\mu}\mathrm{SR}$) on the valence-skipped compound ${\mathrm{AgSnSe}}_{2}$. The temperature dependences of electronic heat $[{C}_{\mathrm{el}}(T)]$ upper critical field...
Single crystals of a new superconductor Bi 2 PdPt have been synthesized and characterized by Laue diffraction, powder X-ray magnetic susceptibility electrical/thermal transport measurements.
Studying superconductivity in Dirac semimetals is an important step understanding quantum matter with topologically non-trivial order parameters. We report on the properties of superconducting phase single crystals material LaCuSb2 prepared by self-flux method. find that chemical and hydrostatic pressure drastically suppress transition. Furthermore, due to large Fermi surface anisotropy, magnetization muon spin relaxation measurements reveal Type-II for applied magnetic fields along...
Transition-metal-based carbides (TMCs), renowned for their exceptional hardness, mechanical strength, and thermal properties, have recently emerged as promising candidates topological superconductivity. In this study, we synthesized ReC in the NaCl structure at ambient pressure by substituting Mo or W Re-site. We investigated superconducting properties of Re$_{1-x}$T$_{x}$C (where T = Mo, W) $x 0.5$ using magnetization, resistivity specific heat measurements. These compounds display type-II,...
The experimental study of magnetism on the Shastry-Sutherland lattice has been ongoing for more than two decades, following discovery first materials SrCu$_2$(BO$_3$)$_2$. However, systems is often complicated by requirements high magnetic fields ($>$~20~T SrCu$_2$(BO$_3$)$_2$) or presence itinerate electrons (e.g. REB$_4$). In this paper, we present properties material Er$_2$Be$_2$GeO$_7$. Like SrCu$_2$(BO$_3$)$_2$, Er$_2$Be$_2$GeO$_7$ exhibits fractionalized magnetization plateaus. Unlike...